<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo</title>
</head>

<body>

</body>
<script type="text/javascript">
function move({x = 0, y = 0} = {}) {
    return [x, y];
}
console.log(move({x:3, y:8})); // [({x: 3, y: 8}); // [3, 8]
console.log(move({x: 3})); // [3, 0]
move({}); // [0, 0]
move(); // [0, 0]
</script>

</html>